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Does the 220 PeV Event at KM3NeT Point to New Physics?

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A recent high-energy neutrino detection by KM3NeT, but not IceCube, suggests new physics. Sterile neutrino oscillations over long distances may explain this discrepancy, potentially indicating new discoveries in neutrino astronomy.

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Area of Science:

  • Particle Physics
  • Astrophysics
  • Neutrino Astronomy

Background:

  • The KM3NeT experiment detected a high-energy neutrino (100 PeV), significantly more energetic than IceCube's catalog.
  • A tension exists between KM3NeT and IceCube observations, with IceCube expected to detect similar events given its capabilities.
  • Neutrinos detected by KM3NeT travel through denser matter (rock/sea) than those reaching IceCube (ice), differing by ~133 km.

Purpose of the Study:

  • To resolve the tension between KM3NeT and IceCube high-energy neutrino observations.
  • To investigate the role of sterile neutrino oscillations in explaining the observed event discrepancy.
  • To explore new physics scenarios involving neutrino interactions and matter potentials.

Main Methods:

  • Analyzing the difference in neutrino propagation distances for KM3NeT and IceCube.
  • Modeling sterile-to-active neutrino oscillations as a potential explanation for the flux difference.
  • Examining two specific models: resonance in sterile-to-active transitions via new physics matter potential and nonstandard interactions.

Main Results:

  • Sterile-to-active neutrino oscillations at ~100 km scales can increase active neutrino flux near KM3NeT.
  • This oscillation mechanism alleviates the tension between the KM3NeT and IceCube observations.
  • The findings suggest that neutrino telescopes might be observing evidence of new physics.

Conclusions:

  • The observed high-energy neutrino event discrepancy can be explained by sterile neutrino oscillations.
  • This phenomenon is relevant at the ~100 km propagation scales relevant to KM3NeT's detection.
  • Neutrino telescopes may be on the verge of detecting new fundamental physics beyond the Standard Model.